q_id stringlengths 5 6 | title stringlengths 3 301 | selftext stringlengths 0 39.2k | document stringclasses 1
value | subreddit stringclasses 3
values | url stringlengths 4 132 | answers dict | title_urls list | selftext_urls list | answers_urls list |
|---|---|---|---|---|---|---|---|---|---|
2wdqan | how is it that i remember hundreds of lyrics when i sing along to songs, but i mix them up or forget parts when i try to sing a capella or to instrumental song versions? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2wdqan/eli5_how_is_it_that_i_remember_hundreds_of_lyrics/ | {
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"text": [
"Because you are actually singing with a very very small delay to the actual lyrics, at least the beginning of each line or so, because you can probably finish the lyrics if you have he beginning."
]
} | [] | [] | [
[]
] | ||
4d5bzc | Why exactly do migrating birds move from north to south or vice versa in one long event, rather than gradually moving around throughout the year? | Taking the migratory bird I'm most familiar with, Canada Geese wait until a certain time of year before packing everything up and moving in one go. Is there a reason why they move in one large event, rather than slowly changing latitude as the weather gradually changes? It seems less efficient energy-wise to marathon t... | askscience | https://www.reddit.com/r/askscience/comments/4d5bzc/why_exactly_do_migrating_birds_move_from_north_to/ | {
"a_id": [
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"text": [
"Well, first of all, there are several types of migration, and there are some forms that are more similar to your description. Those are usually called Irruptive Migrations. But basically, most Migration depends on food amounts. Birds typically mi... | [] | [] | [
[
"http://www.enature.com/birding/migration_home.asp"
]
] | |
2r33qe | If I were to strike a tuning fork in space(without dampening from air), would the metal vibrate indefinitely? Would this be an effective way to store energy? | askscience | http://www.reddit.com/r/askscience/comments/2r33qe/if_i_were_to_strike_a_tuning_fork_in_spacewithout/ | {
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"No, the attenuation caused by the vibrating material would eat up the energy. You might heat up the object a bit as a result, or cause some plastic deformation.",
"While t... | [] | [] | [
[],
[],
[],
[]
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1ewujo | Who is our evolutionary "common ancestor"? | From what I understand, the prevailing theory is that we have not evolved from chimpanzees, or any modern ape, or even identified prehistoric primates like homo habilis, and that we share a common ancestor with all those organisms. Assuming my understanding is correct, do we have fossils or even a name for our most rec... | askscience | http://www.reddit.com/r/askscience/comments/1ewujo/who_is_our_evolutionary_common_ancestor/ | {
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"text": [
"The problem with your question is, our most recent common ancestor with whom? With each other? The most recent common common ancestor of all humans (*Homo sapiens sapiens*) is by definition *Homo sapiens sapiens*. Are you as... | [] | [] | [
[],
[
"http://en.wikipedia.org/wiki/Homo_habilis",
"http://en.wikipedia.org/wiki/Sahelanthropus",
"http://en.wikipedia.org/wiki/Homo_ergaster",
"http://en.wikipedia.org/wiki/Australopithecus",
"http://en.wikipedia.org/wiki/Homo_heidelbergensis"
]
] | |
6jcvy9 | why do humans get headaches? is there a sole reason or is it a combination of factors? and does the factor(s) also cause migraines? | I realize when I am dehydrated, I get headaches, but also over stimulation may also cause it for Me? I'm extremely curious and any help/ answers would be greatly appreciated. | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/6jcvy9/eli5_why_do_humans_get_headaches_is_there_a_sole/ | {
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"The exact mechanism that causes headaches isn't/aren't yet fully understood. All we know is that there are many known factors that can trigger it. Like blood vessel constriction/dilation, and a change in hormone levels. (And... | [] | [] | [
[],
[]
] | |
6fr19u | Looking for WW1 combat reports from units issued body armor | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/6fr19u/looking_for_ww1_combat_reports_from_units_issued/ | {
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"text": [
"You'd have to dig in the archives for actual military documents, but you might take a look at Bashford Dean's [Helmets and Body Armor in Modern Warfare](_URL_0_) (1920), which covers many types of body armor used by differen... | [] | [] | [
[
"https://books.google.com/books?id=8SvEBQAAQBAJ&pg=PA5&dq=bashford+dean+armor&hl=en&sa=X&ved=0ahUKEwiQl8qTpcnRAhUp6oMKHaFSAx4QuwUIJTAB#v=onepage&q&f=false"
],
[
"https://www.reddit.com/r/AskHistorians/comments/60oagx/in_the_game_battlefield_1_some_soldiers_are_seen/df9ccy5/... | ||
nijzn | Is it possible for humans, in the far future, to colonize a planet moving at such a speed that time moves 50% slower than at Earth? | Would the speed make the planet inherently inhabitable and what speed would it require (sorry, my physics are a bit rusty)?
If not a planet, maybe a space station? | askscience | http://www.reddit.com/r/askscience/comments/nijzn/is_it_possible_for_humans_in_the_far_future_to/ | {
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"text": [
"Well, that means it's moving at 86% the speed of light relative to some frame (let's say, the CMB anisotropy frame). That's really fast. The fastest known orbital system is the star S2 which orbits the supermassive black h... | [] | [] | [
[],
[]
] | |
63z1m2 | the assad regime | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/63z1m2/eli5_the_assad_regime/ | {
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"text": [
"Heads up, there are serious conspiracy theorists on both sides of this issue right now from T_D and Trump/Putin truthers.\nIf you want to learn about geopolitics, this NOT the place. If you want an ELI... | [] | [] | [
[],
[],
[]
] | ||
75nqx7 | How realistic was Churchills plans to invade Russia in WW2? Could it have succeeded? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/75nqx7/how_realistic_was_churchills_plans_to_invade/ | {
"a_id": [
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"text": [
"Which plan of Churchill are you asking about? Both the planned [Operation Pike](_URL_0_) and [Operation Unthinkable](_URL_1_) would have involved offensive operations against the Soviet Union. There were also [Franco-British plans to intervene i... | [] | [] | [
[
"https://en.wikipedia.org/wiki/Operation_Pike",
"https://en.wikipedia.org/wiki/Operation_Unthinkable",
"https://en.wikipedia.org/wiki/Franco-British_plans_for_intervention_in_the_Winter_War"
]
] | ||
alq28q | How old is the oldest DNA/RNA that has been extracted? Is it the same as the molecules all living organisms have in their cells now? Did nucleic acids evolve or are they the same as they were when life began 4 billion years ago. | It is fantastic enough to think that all life shares the same DNA/RNA. Did these nucleic acids start it all off in primordial times or do we know if they have evolved themselves as life complexity grew? | askscience | https://www.reddit.com/r/askscience/comments/alq28q/how_old_is_the_oldest_dnarna_that_has_been/ | {
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"text": [
"DNA will break down over time. The oldest DNA ever reliably recovered was a couple hundred thousand years old, ... | [] | [] | [
[],
[],
[],
[],
[],
[],
[]
] | |
18kjh2 | what this tesla model s thing is about? | I think I started reading the articles a little too late and to be quite honest I don't get it. Its always on the front page and just makes no sense to me | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/18kjh2/eli5_what_this_tesla_model_s_thing_is_about/ | {
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"text": [
"Journalist smears Tesla.\n\nTesla responds with telemetry showing journalist lied about events in article.",
"A New York Times journalist wrote an [unflattering article](_URL_1... | [] | [] | [
[],
[
"http://www.teslamotors.com/blog/most-peculiar-test-drive",
"http://www.nytimes.com/2013/02/10/automobiles/stalled-on-the-ev-highway.html?ref=business&_r=2&pagewanted=all&#h",
"http://wheels.blogs.nytimes.com/2013/02/14/that-tesla-data-what-it-says-and-what-it-doesnt/",
"http://w... | |
2o8eao | if the french helped us with the american revolution, gifted us the statue of liberty, and we liberated them from the nazi's, why is there a mutual dislike of eachother? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2o8eao/eli5_if_the_french_helped_us_with_the_american/ | {
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"text": [
"1. Americans invent the insult \"cheese eating surrender monkeys\", to describe the French.\n\n2. The term was used by Jonah Goldberg, a conservative American National Review journalist in April 1999 as... | [] | [] | [
[],
[],
[]
] | ||
2t9kg8 | can somebody please explain what /r/galacticpeacekeepers and all the associated subreddits are? | I've been looking through this sub and some that are associated with it. I think I may have bleeding in my brain after reading some of those posts. Is there some story behind this or is it all nonsense? I'm so confused it hurts. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2t9kg8/eli5_can_somebody_please_explain_what/ | {
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"text": [
"/r/galacticpeacekeepers\n\nA link to help out. Since OP obviously doesn't care about you.",
"Red, Green, and Blue took over The Seventh World and enslaved its inhabitants. The... | [] | [] | [
[],
[],
[],
[]
] | |
8ijx7a | what property in substances cause light to speed up or slow down | How can light slow down then suddenly speed up. For example, if i send a beam of light through glass, it defracts at a certain angle and light slows down. Once it pass through the glass it speeds up. How does this occur? Shouldn't energy just be lost and not be regained? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/8ijx7a/eli5_what_property_in_substances_cause_light_to/ | {
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"Light is an electromagnetic wave. The atoms in a substance act as barriers to the propagation of the wave. At each barrier, the wave bends and interferes with other parts of the wave. All-in-all the wave will interfere with itself in such a wa... | [] | [] | [
[]
] | |
9ktvfj | Why was Vietnam able to transition to capitalism from a failing socialist state when the USSR collapsed attempting to do so? | I was reading recently about the *Đổi Mới* reforms introduced during Nguyễn Văn Linh's tenure as general secretary in the late 1980s, and wondering why Vietnam, based on a Soviet model of socialism, was able to transition to capitalism without collapsing, while the contemporary Soviet *perestroika* and *glasnost* led t... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/9ktvfj/why_was_vietnam_able_to_transition_to_capitalism/ | {
"a_id": [
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"text": [
"First, the USSR under Gorbachev in no way tried to transition to capitalism. Gorbachev was, by all counts, a committed communist who believe that the USSR needed reform but that reform could make socialism* work.\n\nSo tha... | [] | [] | [
[],
[]
] | |
e9hc2g | What was Gettysburg all about? | I know that the Confederate States of America needed an important victory,but what else built up leading to the battle of Gettysburg? Oh and why Gettysburg? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/e9hc2g/what_was_gettysburg_all_about/ | {
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"score": [
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"text": [
"Lee was coming off an absolutely devastating victory over the Union army under Hooker at the Battle of Chancellorsville. His decision to invade the north was based on a few things:\n\n* He avidly read antiwar (\"Copperhead\") newspapers from the... | [] | [] | [
[]
] | |
5oy9b8 | What's up with this postcard? | _URL_0_ | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/5oy9b8/whats_up_with_this_postcard/ | {
"a_id": [
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"text": [
"Was it common for Japanese soldiers to carry postcards into battle? What does the postcard say? For some context, this was taken off of a Japanese soldier during WW2 by a friend of mine's grandfather during his time in the Pacific theatre. "
]
... | [] | [
"https://imgur.com/a/nfVp6"
] | [
[]
] | |
2j7bxl | How were ancient oral epics like the Iliad, the Odyssey, the Gilgamesh epic, etc. recited? | All of the above are fairly long literary works, and I would imagine they would take considerable time to recite them, so how was this done? And during what social circumstances? Were the epics broken up over a course of several days, or were epic never recited in its entirety but only told in smaller episodes? (E.g. "... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/2j7bxl/how_were_ancient_oral_epics_like_the_iliad_the/ | {
"a_id": [
"cl98rx3"
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"text": [
"Your guesses are spot on. These epics are broken into pretty discrete episodes, and you'll see scholars referring to \"The Song of Diomedes\" as a unit of the Iliad (that being the section where Diomededs leads the Greeks and wounds Venus). The r... | [] | [] | [
[]
] | |
40utmo | how cloud storage systems (email, google drive, onedrive) don't run out of storage | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/40utmo/eli5how_cloud_storage_systems_email_google_drive/ | {
"a_id": [
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"text": [
"The very simple answer is that they can always add mode storage as usage grows. Same way you can add storage to your home system. ",
"Cloud providers run specialized storage software that allows for any amount of data to... | [] | [] | [
[],
[]
] | ||
1c122g | How strong is the force that repels electrons? | So I've heard that the nucleus of atoms never actually touch because of the cloud of electrons. So how strong are these electrons? Is there a weight where the electrons would give way and cause the nuclei to touch? And would hydrogen be weaker than say uranium since hydrogen atoms only have one electron? | askscience | http://www.reddit.com/r/askscience/comments/1c122g/how_strong_is_the_force_that_repels_electrons/ | {
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"text": [
"Strong enough to keep you from falling through whatever you're sitting on right now.",
"The force that repels electrons is called the electromagnetic force, and it's repulsive in this case because electrons all have the... | [] | [] | [
[],
[
"http://en.wikipedia.org/wiki/Strong_interaction"
]
] | |
9zwqer | Why/how do fish demonstrate vigor at temperatures that render reptiles and amphibians immobile? | askscience | https://www.reddit.com/r/askscience/comments/9zwqer/whyhow_do_fish_demonstrate_vigor_at_temperatures/ | {
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"text": [
"I am admittedly not a physiologist so my answer is a bit limited in scope, but I can get us started.\n\nOn average, water is much colder than the air temperatures of areas that reptiles and amphibians inhabit. Because of this, the fish’s enzymes ... | [] | [] | [
[]
] | ||
1qi7uf | the two dollar bill. | Why do they make them? Why do they seem so rare, but also not very rare at all? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1qi7uf/eli5_the_two_dollar_bill/ | {
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"text": [
"I'm going to assume you're from the US.\n\nTwo dollar bills make up a small amount of the notes in circulation, but they are still being produced so they aren't \"rare\" like old prints and other collectable currency.\n\nIf ... | [] | [] | [
[],
[]
] | |
5lz4kl | why do american corporations have the same constitutional rights as citizens? isn't this the reason they are able to become so corrupt and able to get all their power and control? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/5lz4kl/eli5_why_do_american_corporations_have_the_same/ | {
"a_id": [
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" > The basis for allowing corporations to assert protection under the U.S. Constitution is that they are organizations of people, and the people should not be deprived of their constitutional rights when they act collectiv... | [] | [] | [
[],
[]
] | ||
2nepbc | why don't web pages refresh automatically after failing to load the first time? | When at work, a large hospital with shaky internet connection, and load a page, loading sometimes "stalls". A spinning icon indicates that the page is loading, but nothing comes up. At this point, even if I wait for say half a minut or more, nothing happens. But if I manually refresh the page at any point, it loads ins... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2nepbc/eli5_why_dont_web_pages_refresh_automatically/ | {
"a_id": [
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"text": [
"A browser doesn't necessarily know what's slowing down the network. All it knows is that the server has told it more data is coming, but has not yet been provided.\n\nA few reasons that the data isn't there yet:\n\n* It hasn't been generated yet... | [] | [] | [
[]
] | |
2vbgpk | does being under anesthesia "count" as sleep to your body? | Just wondering.
Edit: Holy shit, this is the most commented thing I've ever posted! | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2vbgpk/eli5_does_being_under_anesthesia_count_as_sleep/ | {
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"cog9u8t",
"cogaf1x",
"cogbida",
"cogd5t8",
"c... | [] | [] | [
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"http://www.radiolab.org/story/black-box/"
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37bxw8 | why is it so difficult to delete online accounts? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/37bxw8/eli5why_is_it_so_difficult_to_delete_online/ | {
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"Firstly, it's because your data is the most valuable thing about you. Your accounts contain all sorts of information from the obvious (your email address) to the unusual (how often you go between log-in... | [] | [] | [
[],
[],
[]
] | ||
141b19 | what a "non-member observer state" is? | All this with Palestine, I don't exactly understand what a non-member observer state means for Palestine and Israel?
^Without ^starting ^any ^huge ^debates ^please | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/141b19/eli5_what_a_nonmember_observer_state_is/ | {
"a_id": [
"c794wco"
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"text": [
"State = The UN recognizes Palestine as a country\n\nObserver = Palestine can send a representative to listen to UN meetings\n\nNon-member = Palestine's representative can't vote on UN issues"
]
} | [] | [] | [
[]
] | |
77mqhs | What is the most realistic answer to the question of how earlier humans consistently (or inconsistently) made fire without proper fire making tools? | I’ve tried the whole “twist a stick on some kindling” method and I’ve never been successful. I’m fairly fit, and the most I’ve dedicated to trying such a method was an hour at a time, but I just come nowhere near making a real fire. Were they just a hell of a lot stronger and enduring? Did they have longer sticks? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/77mqhs/what_is_the_most_realistic_answer_to_the_question/ | {
"a_id": [
"don1vbv",
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"text": [
"Hi there -- while this question may garner some answers here, you may also want to crosspost it to r/askanthropology. ",
"I don't have an answer, but I'd appreciate if I could ask for some specific detail around this que... | [] | [] | [
[],
[]
] | |
1toimf | Cooling without fridge? | Is there any alternative methods of cooling liquids down during a power outage (and there is no cold running water or cold weather outside)? Cooling without modern technique so to speak?
(don't know if to label physics, chemistry or engineering) | askscience | http://www.reddit.com/r/askscience/comments/1toimf/cooling_without_fridge/ | {
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3,
2
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"text": [
"How much cooling do you need? You can cool small objects a few degrees by wetting them and letting the water (alcohol works better) evaporate.",
"Dissolv... | [] | [] | [
[],
[
"http://www.academia.edu/1136936/Reviving_the_Use_of_Saltpetre_for_Refrigeration_a_Period_Technique"
],
[
"http://en.wikipedia.org/wiki/Gas-absorption_refrigerator",
"http://en.wikipedia.org/wiki/Icyball",
"http://en.wikipedia.org/wiki/Einstein_refrigerator",
"http://en.wikipedia.org... | |
eeczus | What did Medieval people think about elves? | Alfred the Great's name means something like "Elf Council" or "Counseled by Elves" or even "Elf Wisdom".
This indicates that medieval people, the Anglo-Saxons at the very least, had Elves in their mythology. I've often thought of elves in the context of Christmas or Tolkien, but my question here is basically:
What di... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/eeczus/what_did_medieval_people_think_about_elves/ | {
"a_id": [
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"score": [
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"text": [
"Hi! /u/sagathain, /u/Itsallfolklore and I addressed a very similar question to this [here](_URL_0_). I hope it helps.",
"This question is *extremely* difficult to answer for two reasons:\n\n1) the evidence for how people... | [] | [] | [
[
"https://www.reddit.com/r/AskHistorians/comments/dl2o9z/why_was_alfred_the_great_called_elfcounsel_and"
],
[
"https://twitter.com/DrFrancisYoung/status/1206880008268062720"
]
] | |
159f1r | From an engineering perspective, why don't recreational boats have a transmission? | basically every type of transportation we use (bikes, cars, trucks etc) have a transmission. The idea being to lower the rpm at higher speeds to for what I imagine is better fuel efficiency.
I've never seen a boat with a transmission...they are all just one gear. It doesn't make sense to me that with a V8 engine you h... | askscience | http://www.reddit.com/r/askscience/comments/159f1r/from_an_engineering_perspective_why_dont/ | {
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"score": [
4,
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"text": [
"Do recreational boats perhaps use [controllable pitch propellers](_URL_0_)?",
"High speed recreational boats do have transmissions. [Most have 2 speed](_URL_0_)\n\nFor the fo... | [] | [] | [
[
"http://en.wikipedia.org/wiki/Controllable_pitch_propeller#Ships"
],
[
"http://www.mbsports.net/accessory_view.asp?accessory=transmission"
],
[],
[]
] | |
6ar0t9 | How did the Sassanid Empire deal with Huns? Why were they able to resist them while the Romans weren't ? | Edit: just to be clear, I am mainly talking about the "true" Huns after they ransacked the Eastern Roman Empire
| AskHistorians | https://www.reddit.com/r/AskHistorians/comments/6ar0t9/how_did_the_sassanid_empire_deal_with_huns_why/ | {
"a_id": [
"dhh57h9"
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"text": [
"There were several waves of Hunnic people the Sasanians faced beginning with those known in the Latin sources as the Chionites but including the Kidarites and Hephthalites as well. The short story is that they did not resist them very well. From... | [] | [] | [
[]
] | |
szijv | What civilisations spent their entire history as Nomadic or semi-nomadic? | Hey, I'm looking for any civilisations that remained nomadic and did adopt sedentary agrarian living. All I can think of is the Aborigines of Australia.
Are there any more? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/szijv/what_civilisations_spent_their_entire_history_as/ | {
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"text": [
"What do you consider a civilization? Consider all the people who lived in and around the Central Asian steppes -- Scythians, Sarmatians, Mongols, etc. Also some of the Plains Indians in the Americas.",... | [] | [] | [
[],
[
"http://en.wikipedia.org/wiki/Bedouin"
],
[]
] | |
1fioms | why do low-resolution videos viewed in full-screen look blurry and not pixelated? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1fioms/eli5_why_do_lowresolution_videos_viewed_in/ | {
"a_id": [
"caanaps",
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6,
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"text": [
"Because the program you're using decided that it would handle stretching videos by blending colors together instead of pixelating it.",
"Because most modern video players use a method of post-proce... | [] | [] | [
[],
[],
[
"https://en.wikipedia.org/wiki/Image_scaling"
]
] | ||
2mvb8e | what is group velocity and how can it be faster than the speed of light? | In [this article](_URL_0_) a physicist managed to make sound travel at a group velocity that is faster than the speed of light. I understand that nothing can move faster. Can someone explain what's the catch here? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2mvb8e/eli5_what_is_group_velocity_and_how_can_it_be/ | {
"a_id": [
"cm7w53d"
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"score": [
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"text": [
"Physics Grad Student here.\n\nSo what is important is the assumption that \"nothing can move faster than light\". This is something you always hear which, however is not actually true. The speed of light as a maximum limit of speed is only restr... | [] | [
"http://physicsworld.com/cws/article/news/2005/nov/01/could-sound-move-at-the-speed-of-light"
] | [
[
"http://imgur.com/OlVwlGl"
]
] | |
dhanb0 | What, besides the ship skin, protects cosmonauts from solar radiation during the long stay in space? | If I'm not mistaken, solar radiation is able to almost fully pass through the ship skin and deal damage to cosmonauts' health. So, how can people be protected from it during for example the flight to Mars which will last for about 8 months?
Edit: in near-Earth orbit partially protects the Earth’s magnetic field, ... | askscience | https://www.reddit.com/r/askscience/comments/dhanb0/what_besides_the_ship_skin_protects_cosmonauts/ | {
"a_id": [
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"score": [
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2,
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"text": [
"It is probably the case that some elevated level of radiation exposure is going to be necessary for interplanetary travel. The primary defense against radiation-induced harm is to track individual astro... | [] | [] | [
[],
[],
[]
] | |
7ls2ik | why is salmon the only fish that is smoked? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/7ls2ik/eli5_why_is_salmon_the_only_fish_that_is_smoked/ | {
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"text": [
"It's not. My favorite is smoked haddock aka finnan haddie. Smoked whitefish is a standard at Jewish delis. Smoked trout, smoked herring (kippers)...and of course smoked oysters.",... | [] | [] | [
[],
[],
[],
[]
] | ||
yxpcs | why society shelters children from knowing about sexuality | I'm not saying they should teach it in schools or anything, but why shouldn't a parent feel comfortable telling their five-year-old where babies come from, if they ask?
Edit: I'm not only talking about parent-to-child conversations. We shelter our children from sexuality in movies and TV, and I'm sure there are lots o... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/yxpcs/eli5_why_society_shelters_children_from_knowing/ | {
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"score": [
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"text": [
"Because Jesus doesn't like it. And if you ask me again God's gonna punish you. Now go to your room.",
"I think mostly its a generational thing, their parents didn't tell t... | [] | [] | [
[],
[],
[],
[]
] | |
68wswd | how do the toasters at subway get a crispy toast so fast | Microwaves make bread soggy but a toaster oven isn't nearly as fast, what is this wizardry? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/68wswd/eli5_how_do_the_toasters_at_subway_get_a_crispy/ | {
"a_id": [
"dh2awvt"
],
"score": [
2
],
"text": [
"Used to work at Subway, those ovens are always around 500°. Like melt your glove to your hand hot. That's why we used a paddle to insert/remove subs."
]
} | [] | [] | [
[]
] | |
5796sn | why is the earth elliptical? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/5796sn/eli5_why_is_the_earth_elliptical/ | {
"a_id": [
"d8q1csi",
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"score": [
3,
13
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"text": [
"The earth spins on its axis so it bulges in the middle. That's pretty much the whole story. Jupiter and Saturn are much larger and rotate even faster so you can see how oval they are in a telescope or in pictures. The ea... | [] | [] | [
[],
[]
] | ||
4l4gn6 | why do some games have a problem with cheaters(cs:go) and some don't(rocket league)? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4l4gn6/eli5_why_do_some_games_have_a_problem_with/ | {
"a_id": [
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"score": [
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2,
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"text": [
"For one, you need a good easy way to cheat. You can do this by either giving you an unfair advantage, (Like giving you more info than the opponent) or by letting the computer do stuff for you its very ... | [] | [] | [
[],
[],
[]
] | ||
3b338h | What happened to Russian citizens after the purchase of Alaska? | What happened to the Russians in Alaska after the US bought the territory? Did they go back to Russia? Did they stay in Alaska? Were there a very minimal amount of Russians in the territory? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/3b338h/what_happened_to_russian_citizens_after_the/ | {
"a_id": [
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"text": [
"I don't want to discourage people from adding additonal information here, but [someone asked the same question yesterday,](_URL_0_) so maybe you'll find the answers there helpful.",
"Howdy!\n\nW... | [] | [] | [
[
"http://www.reddit.com/r/AskHistorians/comments/3awds7/what_happened_to_the_russian_colonists_in_alaska/"
],
[],
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] | |
1jmlxx | why isn't catherine, dutchess of cambridge called princess catherine? | I was going to ask why she isn't a princess, but on the new baby's birth registration, the father is HRH Prince William... But she is listed as Catherine Elizabeth, HRH Dutchess of Cambridge. No Princess. However, her occupation is listed as Princess of the UK. Why the difference in title? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1jmlxx/why_isnt_catherine_dutchess_of_cambridge_called/ | {
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"text": [
"I believe because she does not have royal blood - she married into royalty.",
"There are two kinds of princesses: female princes a... | [] | [] | [
[],
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[],
[],
[],
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] | |
d31yav | Are there horror stories that come from the middle ages? | Horror seems like a super popular genre now, was there an "industry" or circulating set of stories that would seem parallel to our horror genres now? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/d31yav/are_there_horror_stories_that_come_from_the/ | {
"a_id": [
"ezyjz4k"
],
"score": [
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"text": [
"Thank you for the interesting question! I'll preface this by stating that I focus on the 12th Century in England and France.\n\nLots of chroniclers included anecdotes that contain supernatural elements, some of which are similar to stories we te... | [] | [] | [
[
"https://sourcebooks.fordham.edu/basis/williamofnewburgh-one.asp#28"
]
] | |
44jczj | what makes dog years different from human years+ | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/44jczj/eli5_what_makes_dog_years_different_from_human/ | {
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"score": [
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"text": [
"There's really no such thing as \"dog years\". It's just a way to give a rough estimate of how old a dog is compared to a human lifespan. Humans live roughly seven times a long as dogs (though it var... | [] | [] | [
[],
[],
[]
] | ||
8hzq4o | At a cellular level, is there a difference between mammals, birds, fish, amphibians, and reptiles? | askscience | https://www.reddit.com/r/askscience/comments/8hzq4o/at_a_cellular_level_is_there_a_difference_between/ | {
"a_id": [
"dypvg3q"
],
"score": [
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"text": [
"If you are talking the contents of a cell, they roughly have the same features \\(i.e. organelles, cytoskeleton\\). All will have a nucleus with DNA. All will have mitochondria. You would have a hard time distinguishing cells as mentioned by k... | [] | [] | [
[]
] | ||
5c7chf | What was the extent of the Known world in ancient Egypt? | I was looking for ancient Egyptian world maps, but I couldn't find any. Thank you. | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/5c7chf/what_was_the_extent_of_the_known_world_in_ancient/ | {
"a_id": [
"d9uetrr",
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"score": [
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20
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"text": [
"Do you have a specific date or dynasty? ",
"This is my first post, so I hope that I'm doing this correctly :)\n\nI'm going to assume that you are asking from Egypt's point of view as opposed to the entire world. \nDue ... | [] | [] | [
[],
[
"https://upload.wikimedia.org/wikipedia/commons/0/0c/Near_East_1400_BCE.png",
"https://www.youtube.com/watch?v=hyry8mgXiTk"
]
] | |
3ahmck | why cars don't have built in breathalyzers to prevent drunk driving. | It seems like it'll instantaneously fix the whole drunk driving problem, or at least fix it in a tremendous manner.
It also seems cost effective too since insurance companies will have to pay out less for accidents, so they can provide a discount to insurers.
EDIT: When i say built in, i'm referring to the car not ... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/3ahmck/eli5_why_cars_dont_have_built_in_breathalyzers_to/ | {
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"text": [
"Because it'd be weirdly invasive to try and force people to buy cars with what amounts to a monitoring system and it wouldn't be effective; you can't police everybody full time and... | [] | [] | [
[],
[
"http://carbreathalyzerhelp.com/?utm_content=3021774689"
],
[],
[]
] | |
2lsj4a | Was Lenin that bad? | I know this is a very subjective question, so maybe we can use Stalin as a reference. Would Lenin have been as bad as Stalin? Was Lenin as opportunistic as Stalin? Would Lenin have purged as many people? Could the USSR have survived if Lenin theoretically controlled it for the entire 20th century?
I'm reading a book o... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/2lsj4a/was_lenin_that_bad/ | {
"a_id": [
"clxtni1"
],
"score": [
14
],
"text": [
"I'd have to be really frustrating and say this isn't really an answerable question. If we were to simplify it and just compare Lenin to Stalin, the thing is that Lenin and Stalin were operating in very different times, under different constraint... | [] | [] | [
[]
] | |
lte78 | What is the efficacy of these alarm clocks which use some sort of head-band scanner (I assume EEG) to select the time to wake you? (example linked to in comments) | I have been interested in these for a while, and wanted to some scientific insight.
Does anyone know if these things have been scientifically validated in any way?
Here is an example:
_URL_0_ | askscience | http://www.reddit.com/r/askscience/comments/lte78/what_is_the_efficacy_of_these_alarm_clocks_which/ | {
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"text": [
"The method has been [validated](_URL_1_), however the efficacy of the device to improve sleep [has not been](_URL_0_).\n\n",
"I'm sure you know about brain waves and stages of ... | [] | [
"http://www.myzeo.com/sleep/shop/zeo-sleep-manager-mobile.html"
] | [
[
"http://www.myzeo.com/sleep/sites/default/files/Zeo%20HUT%20White%20Paper_2009.pdf",
"http://www.myzeo.com/sleep/validation"
],
[
"http://web.mst.edu/~psyworld/general/sleepstages/sleepstages.pdf",
"http://blog.smart-alarm-clock.com/search/label/Features",
"http://www.gamesradar.com/mindwa... | |
4w40ih | Why is blue light the first to get absorbed into the atmosphere through rayleigh scattering, but it penetrates water deeper than other colors? | I am out fishing and there are guys with lights that they use to light up the water in the back of the boat when it is dark out so they can see the fish, but all of the lights are either blue or more commonly green. I know from my stage crew days that blue is very hard to produce well, and that the human eye is most ad... | askscience | https://www.reddit.com/r/askscience/comments/4w40ih/why_is_blue_light_the_first_to_get_absorbed_into/ | {
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"text": [
"Blue light gets scattered the most in the atmosphere, that is why the sky looks blue. The exact same is true... | [] | [] | [
[],
[],
[
"https://upload.wikimedia.org/wikipedia/commons/1/18/Absorption_spectrum_of_liquid_water.png"
],
[],
[],
[],
[]
] | |
7r0mk6 | why does radiation spike and roam | Places like Chernobyl and Fukushima are obviously closed off to the public for radiation. I understand that objects can absorb radiation and thus become radiated, but how is it that when walking around outside these places, radiation can spike? Or one second you can be fine, but the next you have to move because the ra... | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/7r0mk6/eli5_why_does_radiation_spike_and_roam/ | {
"a_id": [
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"score": [
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"text": [
"What is radiating are tiny radioactive particles. Like dust, they can accumulate in certain places because of natural forces such as wind or rain. In your house or flat, dust usually accumulates in certain places, yes? That happens to radioactive... | [] | [] | [
[]
] | |
702m13 | How would high medieval spearmen handle other infantry armed with swords and shields? | I've started doing Dagorhir, and one thing I've noticed is that spears have a big disadvantage against anyone armed with a shield. Shields are a lot easier to maneuver than the point of a spear several feet out from the wielder. Thus it's easy for a shieldbearer to block all thrusts and close in without the spearman be... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/702m13/how_would_high_medieval_spearmen_handle_other/ | {
"a_id": [
"dn2hh26"
],
"score": [
6
],
"text": [
"Hey, I know your larp!\n\nFirst, let's establish some historical baselines. Spear and shield was common in the early middle ages, especially in the 5th and 6th centuries. After that, swords gained ground steadily as metallurgy improved and econom... | [] | [] | [
[]
] | |
1bnb94 | Why do most insulins advise strongly against mixing with other insulins? What would happen if a mixed injection was taken? | askscience | http://www.reddit.com/r/askscience/comments/1bnb94/why_do_most_insulins_advise_strongly_against/ | {
"a_id": [
"c98d2hd"
],
"score": [
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"text": [
"Some insulins can be mixed. Examples are Regular and NPH or an ultra short like Lispro and NPH, which get mixed all the time in hospitals, and even come premixed (Novolin 70/30, Novolog 70/30). The ultra longs are the only ones that I'm aware of ... | [] | [] | [
[
"http://care.diabetesjournals.org/content/27/11/2739.full.pdf+html"
]
] | ||
fj3sno | why can your body stop the bleeding from a small cut over the course of a few minutes, but bruises can continue to develop and worsen over the course of a few days? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/fj3sno/eli5_why_can_your_body_stop_the_bleeding_from_a/ | {
"a_id": [
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"score": [
2,
2,
3
],
"text": [
"What you're seeing isn't the bruise getting worse but the blood spreading out. When you get a cut say on your finger, the blood leaves your body and the wound closes. A bruise is a localized, internal b... | [] | [] | [
[],
[],
[]
] | ||
fb0g4z | why does covid-19 hurt the market? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/fb0g4z/eli5_why_does_covid19_hurt_the_market/ | {
"a_id": [
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2,
2,
2,
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"text": [
"If China makes a product for the US and the factory shuts down Because of the virus then there are no products being made. Which means people lose money since they can't sell their... | [] | [] | [
[],
[],
[],
[]
] | ||
c2gklj | the difference between paraphilia and fetish | I've tried looking in a dictionary and wikipedia and the ICD-10, but I don't really get the difference. Is one a sub-category of the other, or are they separate? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/c2gklj/eli5_the_difference_between_paraphilia_and_fetish/ | {
"a_id": [
"erjvzgu"
],
"score": [
7
],
"text": [
"A paraphilia is something that is harmful to oneself or others and is needed to achieve orgasm. Paraphilias and fetishes are similar, but not every fetish is harmful, and all paraphilias are in some way. These disorders can cause distress or impa... | [] | [] | [
[]
] | |
xj73x | why would a working class person want to vote for a candidate who favors tax breaks for the wealthy? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/xj73x/eli5_why_would_a_working_class_person_want_to/ | {
"a_id": [
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186,
2,
22,
90,
70,
4,
... | [] | [] | [
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[],
[],
[],
[],
[],
[],
[],
[]
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40ohik | why are possible gravitational waves at ligo significant? | What does this actually mean, and what are its implications for the average bear? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/40ohik/eli5_why_are_possible_gravitational_waves_at_ligo/ | {
"a_id": [
"cyvt7fb"
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"score": [
2
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"text": [
"Stunning confirmation of Einstein's theory of general relativity. Not that other things haven't already been measured, but is another confirmation of a specific prediction, which helps confirm that his theory is correct. Its another stepping sto... | [] | [] | [
[]
] | |
fn6xet | Martin Meredith's "The Fortunes of Africa": A good source on the subject? | Often, I'm content to read reviews and look up the author to gauge whether something like this would be worth reading. But when it comes to Africa, I'm a little nervous I might end up with something either unconsciously racist or overtly racist. Especially when it's an English man doing the writing. Not exactly a wonde... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/fn6xet/martin_merediths_the_fortunes_of_africa_a_good/ | {
"a_id": [
"fl8g5ap"
],
"score": [
2
],
"text": [
"It's a decent introduction to the subject of African history, though if you're looking for detail on certain specific civilizations or events, I'd suggest looking elsewhere. It's a legitimately good broad overview of the history of the continent ... | [] | [] | [
[]
] | |
fa4s2q | Why is g constant regardless of the mass of an object on a planet, but the mass of the planet does matter? | askscience | https://www.reddit.com/r/askscience/comments/fa4s2q/why_is_g_constant_regardless_of_the_mass_of_an/ | {
"a_id": [
"fix1zx5"
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"score": [
32
],
"text": [
"From Newton's universal law of gravity, we have\n\nF=GMm/r^2\n\nwhere we can say M is the Earth's mass, and m is the object's mass.\n\nNewton's 2nd law is:\n\na = F/mass\n\nFor the acceleration of the object by the Earth, we set mass=m and F=GMm... | [] | [] | [
[]
] | ||
5tg8es | How do you know the limit of something as x approaches infinity? | tl;dr: Just the title basically.
So, a freind at school has been talking about e. Her older brother has remembered like 400 decimals of pi and he wanted her to remember e. But this got me thinking about e. I thought about a very typical limit for e. The limit of (1+1/n)^n as n approaches infinity. So i was wondering, ... | askscience | https://www.reddit.com/r/askscience/comments/5tg8es/how_do_you_know_the_limit_of_something_as_x/ | {
"a_id": [
"ddmmdtr"
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"score": [
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"text": [
" > To take the derivative, it seems as if you would need to have infinte precision? It's seems as if though the whole of calculus is based around this infinite precision thing. Integrals use rectangles to approximate the area under a function ri... | [] | [] | [
[
"https://en.wikipedia.org/wiki/Geometric_series"
]
] | |
x82xp | Animals, e.g. (wild) cats, have loads of anonymous sex and know nothing about protection or medicine. Why aren't they decimated by cat aids? | Why aren't wild animal populations riddled with disease when they know nothing of prevention or cure of STDs or other communicable illnesses?
Edit: thanks for the fascinating discussion and insights! TIL many things. | askscience | http://www.reddit.com/r/askscience/comments/x82xp/animals_eg_wild_cats_have_loads_of_anonymous_sex/ | {
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"http://www.pnas.org/content/107/34/15175.abstract"
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3s86i3 | why aren't animals like gorillas who are very strong released back to the wild? | If I'm not correct, animals are not released because they cannot protect themselves or their young anymore but bigger animals like silver back gorillas can. So why are they not released? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/3s86i3/eli5why_arent_animals_like_gorillas_who_are_very/ | {
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"Even silverbacks need to belong to a \"tribe\" of sorts. Outside of the protected tribe, they will die from either predators or even social anxiety. Think its the same for pretty much all wildlife wit... | [] | [] | [
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2d5b3q | why do we have to cook things with a low flame for a long time. why not a high flame for a short amount of time? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2d5b3q/eli5_why_do_we_have_to_cook_things_with_a_low/ | {
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"Large flame means high temperature. High temperature means the outer layer of food might burn before the inside has been heated up.\n\nLow temperature takes more time, but gives you much more even cooking.",
"So the hea... | [] | [] | [
[],
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3qzyml | why does the mixing of alcoholic beverages seemingly get you drunker quicker/why is it seen as such a bad thing? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/3qzyml/eli5_why_does_the_mixing_of_alcoholic_beverages/ | {
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"text": [
"Mixing alcoholic beverages doesn't get you drunk quicker. Drinking more alcohol gets you drunk quicker. People tend to drink quicker when they're drinking... | [] | [] | [
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5kk12w | - why do public restrooms have automatic soap dispensers if you will wash your hands directly after applying the soap? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/5kk12w/eli5_why_do_public_restrooms_have_automatic_soap/ | {
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"text": [
"Perceived convince and portion control. \n\n A huge problem for businesses is users who take way more of bathroom goods that they actually would need, wasting goods and leading to more frequent empt... | [] | [] | [
[],
[],
[]
] | ||
ojqkq | why two unrelated movies, songs or books can have the same title but video game titles are vigorously protected? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/ojqkq/eli5_why_two_unrelated_movies_songs_or_books_can/ | {
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"text": [
"Because in most cases, a game's title is the strongest and most valuable part of its brand, which is often not true for books and especially music.\n\nIn books and music, it is the artist/author which is the stronger part of the brand. For examp... | [] | [] | [
[]
] | ||
5o135n | why do so many books have two to three blank pages at the start? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/5o135n/eli5_why_do_so_many_books_have_two_to_three_blank/ | {
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"Books are assembled in groups of pages ... | [] | [] | [
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"https://eng244.wordpress.com/bookgloss/flyleaf/"
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7uoc2c | how do tv commercials that mention “amazon alexa” prevent the activation of devices? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/7uoc2c/eli5_how_do_tv_commercials_that_mention_amazon/ | {
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"I don't have an Alexa, but I literally JUST watched [this video](_URL_0_) before coming to this sub, which mentioned that Alexa doesn't differentiate between your voice and anyone else's. So it can be activated by your kid, someone on the TV, or ... | [] | [] | [
[
"https://www.youtube.com/watch?v=oI2KLIULjXc"
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4i6qn4 | does the black hole at the center of the milky way have a diameter? | To expand:
I seriously thought black holes have a diameter but I was told they don't. So...
Do all black holes have no diameter?
Do they just start with no diameter and then grow in diameter at matter falls into it?
Does the black hole at the center of the Milky Way have a diameter? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4i6qn4/eli5_does_the_black_hole_at_the_center_of_the/ | {
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"text": [
"It's the singularity that has no diameter. Yes, black holes have event horizons accretion disks which can be measured up to the singularity.",
"Black holes are typically descr... | [] | [] | [
[],
[],
[],
[
"https://upload.wikimedia.org/wikipedia/commons/6/63/Spacetime_lattice_analogy.svg"
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3d5eyz | Was the United States the first country to have money called "dollar"? Where did the name come from? Why was it chosen? Why have so many countries adopted the name? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/3d5eyz/was_the_united_states_the_first_country_to_have/ | {
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"No, the word \"dollar\" is quite a bit older than the US government's unit of currency. It is an anglicised form of \"thaler\", which was the name given to coins first minted in 1519 from silver mined in Joachimsthal in Bohemia. Thaler is a shor... | [] | [] | [
[]
] | ||
je8r3 | what is fcc rules part 15, and why must my devices "accept all interference including interference that may cause undesired operation"? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/je8r3/what_is_fcc_rules_part_15_and_why_must_my_devices/ | {
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"Moreover, what does it mean to accept or reject interference\n?",
"electricity is just magnetism seen from a different point of view... | [] | [] | [
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srrfc | How does the cold war 'communism' scare compare to today's 'war on terror'? | This might be selection bias, but I get the feeling today most people are kind of sick of the saber-rattling. Did we see the same thing after years of rhetoric against 'communists'? How did the public react to the 'communist' threat? Is it the same or different in today's 'war on terror'? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/srrfc/how_does_the_cold_war_communism_scare_compare_to/ | {
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"*Nothing is so irretrievably lost to a socie... | [] | [] | [
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"http://en.wikipedia.org/wiki/Mutual_assured_destruction"
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"http://en.wikipedia.org/wiki/The_Hurt_Locker",
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37202y | Do frozen methane clouds on Titan retain a static shape? | A friend and I were discussing the movie Interstellar when he mentioned that it was impossible for clouds of methane to freeze and be static in shape. Is this true? I know there are frozen methane clouds on Titan, but by frozen does this include their shape? In the movie the cloud could be chipped away, is this possibl... | askscience | http://www.reddit.com/r/askscience/comments/37202y/do_frozen_methane_clouds_on_titan_retain_a_static/ | {
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"The is a big difference between a solid chunk of methane versus a thin accumulation of crystalline droplets. On Earth, some clouds are made of water droplets and others are made of ice. On Titan, the ice methane clouds would behave similarly to t... | [] | [] | [
[
"http://saturn.jpl.nasa.gov/news/cassinifeatures/feature20141024/"
]
] | |
4cdswe | Did the illuminati have a role in the french revolution? (yes, this is serious) | I had been reading up on the illuminati (both real and fictional) for fun, and found that there had been accusations that the illuminati had caused the French Revolution. The theory was promoted by Augustin Barruel, who wrote "Memoirs Illustrating the History of Jacobinism", and John Robison, who wrote "proofs of a con... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/4cdswe/did_the_illuminati_have_a_role_in_the_french/ | {
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"text": [
"The Illuminati, as Augustin Barruel describes it, is fictional. He ties together branches of enlightenment philosophy with various secret societies and claims that it's all one big group. [This link](_URL_0_) has excerpts from an essay that debun... | [] | [] | [
[
"http://freemasonry.bcy.ca/texts/robison-barruel.html#2"
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] | |
gcs4o | What keeps Jupiter, a gas giant, from collapsing under its own gravity and becoming a dense solid? | askscience | http://www.reddit.com/r/askscience/comments/gcs4o/what_keeps_jupiter_a_gas_giant_from_collapsing/ | {
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"text": [
"Hydrostatic equilibrium is what you want to look into. It's what keeps big round things round, from planets to stars.\n\nIn Jupiter's case, the gas at the center is hot from the extreme pressure exerted by gravity. The heat... | [] | [] | [
[],
[]
] | ||
12hkfv | When I look at a projector image on a wall and move my eyes from one end of the image to the other fast, I can see individual RGB lines (a few cm wide). Why? | askscience | http://www.reddit.com/r/askscience/comments/12hkfv/when_i_look_at_a_projector_image_on_a_wall_and/ | {
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"text": [
"not really a science based question, but your projector is DLP (digital light processor) based, meaning it has a chip where each pixel is a microscopic little mirror on a tiny hinge, the projector reflects off the chip, \n\neach mirror switches o... | [] | [] | [
[
"http://electronics.howstuffworks.com/dlp.htm"
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oam5g | Red-shift, Blue Shift and Cosmic Expansion. If the universe has been expanding since the Big Bang, and if the further we look out into space the further back in time we are seeing, shouldn't objects appear to be moving closer to each other and to us and thus be blue shifted, NOT red-shifted? | askscience | http://www.reddit.com/r/askscience/comments/oam5g/redshift_blue_shift_and_cosmic_expansion_if_the/ | {
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"The reason we're \"looking back in time\" is that light just reaching us from the objects at which we're looking left them a long, long time ago. In the meantime, this light has been traversing expanding space, which has acted to increase it's wa... | [] | [] | [
[]
] | ||
1dho4h | why can't we feel our bodies gaining weight, growing taller, etc.? | Is there any type of minor phenomenon we feel that is related to such things? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1dho4h/eli5why_cant_we_feel_our_bodies_gaining_weight/ | {
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"text": [
"It happens really slowly. REALLLLLY SLOWLY.",
"You mean like [growing pains?](_URL_0_) (Although it says right in the article that it probably isn't directly associated with growth)"
]
} | [] | [] | [
[],
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"https://en.wikipedia.org/wiki/Growing_pains"
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9ckptr | how do people afford to live in venezuela if a monthly salary is 3$? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/9ckptr/eli5how_do_people_afford_to_live_in_venezuela_if/ | {
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"The first thing to go are any valuable items like jeweler, then electronics. They sell these, live off of the money as far as possible (not very long) and then resort to scavenging, stealing, eating th... | [] | [] | [
[],
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"https://www.independent.co.uk/news/world/americas/venezuela-weight-loss-average-19lb-pounds-food-shortages-economic-crisis-a7595081.html"
],
[]
] | ||
1p82nz | how astronomers can find a galaxy 30 billion light-years away, twice as far as the universe is old. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1p82nz/eli5_how_astronomers_can_find_a_galaxy_30_billion/ | {
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"text": [
"Space is expanding. The galaxy in question was actually much closer when the photons we're now receiving left it.",
"The initial expansion of the universe... | [] | [] | [
[],
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[],
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"http://www.reddit.com/r/explainlikeimfive/comments/1p3vvf/eli5_how_can_we_tell_a_galaxy_is_30_billion_light/",
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"http://www.reddit.com/r/explainlikeimfive/comments/1p2ncy/eli5_how_can_scientists_have_discovered_a_galaxy/"
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... | ||
1d0mtf | How many Germans actually supported Hitler in his endeavors? | How exactly did he consolidate his power?
When he was party of the minority party how did he get power in the majority?
How come there was no resistance from the population while he was still weak?
sources please | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1d0mtf/how_many_germans_actually_supported_hitler_in_his/ | {
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"text": [
"If you have the time, and a library card, *War and Genocide* Bergen covers what you want to know.",
"Define support.\n\nActively endorsing Nazi ideology and joining the party o... | [] | [] | [
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[],
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"http://select.nytimes.com/gst/abstract.html?res=F00A16FD345F17738DDDAF0894DB405B838FF1D3"
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4jk7c1 | do photons age? | Also, do they expire, like die? If so, what happens to them when they die? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4jk7c1/eli5_do_photons_age/ | {
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"Photons do not experience time, so they do not age as we understand it. They do 'die' whenever they are absorbed. Every photon emitted by your monitor 'dies' in your retina (converted to electrical impulses) so you can read ... | [] | [] | [
[],
[]
] | |
83lexh | if gravity has a quantum manifestation of itself (gravitons), how does anti-matter relate to it? would there be some kind of anti-graviton particle? | I do have a fairly good knowledge of gravitational waves, and a good notion on subatomic particles, however nobody really likes to talk about gravitons and that puzzles my mind intensely.
I'm not expecting anti-gravity effects, but a logical explanation, they're always sound like a justification of why I shouldn't eve... | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/83lexh/eli5_if_gravity_has_a_quantum_manifestation_of/ | {
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"text": [
"The expectation is that gravitons are their own antiparticle, similar to how photons are their own antiparticle. So no, there probably isn't another such particle unless we have things very wrong."
]
} | [] | [
"https://youtu.be/WdVscdDX7ac?t=1m50s"
] | [
[]
] | |
bfufxm | How does Aloe Vera help with sunburns? | askscience | https://www.reddit.com/r/askscience/comments/bfufxm/how_does_aloe_vera_help_with_sunburns/ | {
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"[It probably doesn't.](_URL_0_) Gels and creams feel cool against the skin, because they're room temperature liquids against war... | [] | [] | [
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"https://www.ncbi.nlm.nih.gov/pubmed/16623024"
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[
"http://www.sciencedirect.com/science/article/pii/S0308814606006066",
"http://www.ncbi.nlm.nih.gov/... | ||
1jt4qq | why do businesses build skyscrapers in cities when it would be much cheaper to build their offices further out where land is cheaper? | I understand that in some places, space really is a limitation, but where in live in Perth, Australia for instance, it makes no sense to me why all these giant buildings are grouped together when it would be much more cost efficient to build wider, shorter buildings in cheaper areas. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1jt4qq/eli5_why_do_businesses_build_skyscrapers_in/ | {
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... | [] | [] | [
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3ci01f | how can you know when you've had enough sleep? if you can fall back asleep, are you not done? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/3ci01f/eli5_how_can_you_know_when_youve_had_enough_sleep/ | {
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"text": [
"I can contribute to answer the second question.\n\nWhen you sleep, you have the hormone melatonin in you, that makes you sleepy. Wh... | [] | [] | [
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27n1v8 | why are crossfitters looked down upon by the bodybuilding community? | I hear sayings thrown around like "You'll lose all your gains." and "If your boyfriend does crossfit, you have a girlfriend.". Why does crossfit get a bad rap? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/27n1v8/eli5_why_are_crossfitters_looked_down_upon_by_the/ | {
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"c... | [] | [] | [
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"http://you... | |
2koauw | why do we ask for autographs when we meet famous people? | Why do we want someone's name on a piece of paper? With the popularization of the selfie, it's kind of died out, but why do we want people to sign stuff for us? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2koauw/eli5_why_do_we_ask_for_autographs_when_we_meet/ | {
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"To remember the encounter and to prove to people that we really met them. And to an extent, because the autograph might be worth someth... | [] | [] | [
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320x01 | why was the concept of the month developed/accepted? why don't we count the date as "day 275" of the year, for example? | And if it's something to do with seasons, why not just have 4 months? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/320x01/eli5_why_was_the_concept_of_the_month/ | {
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"score": [
12,
9
],
"text": [
"The concept of the month was based on the cycles of the moon, which last about 29 days. The English word \"month\" comes from the word \"moon\".",
"I feel stupid as hell now, I knew that already"
]
} | [] | [] | [
[],
[]
] | |
1zqdom | In a constant environment at 0 degrees Celsius, will water molecules freeze or melt? | askscience | http://www.reddit.com/r/askscience/comments/1zqdom/in_a_constant_environment_at_0_degrees_celsius/ | {
"a_id": [
"cfw7xi0",
"cfw8g82"
],
"score": [
11,
3
],
"text": [
"In a water/ice mixture, molecules are both 'sticking' to the ice if they have too little energy to overcome the attraction of the water molecules in the ice, and liberating themselves from it if they have enough energy to b... | [] | [] | [
[],
[]
] | ||
7o5fyc | Is there evidence that the founders included cannons and bombs in defending the 2nd Amendment? | Essentially what I am asking is: did the founders believe the 2nd Amendment have limits? Would a constitutional originalist be in favor of allowing unrestricted use of nuclear weapons to the public? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/7o5fyc/is_there_evidence_that_the_founders_included/ | {
"a_id": [
"ds73w6a",
"dt76gzr"
],
"score": [
8,
2
],
"text": [
"The 2nd Amendement is not terribly concerned with individual ownership of weaponry, it's concerned with civilian oversight of the military. It is impossible to separate the writing of the 2nd Amendment from the militia laws,... | [] | [] | [
[],
[
"https://www.reddit.com/r/AskHistorians/comments/4oh8ft/were_americans_allowed_to_own_cannons_under_the/"
]
] | |
2q5upk | If DNA stores information of how to make proteins, where is the information for what to do with the proteins stored? | In my (admittedly lacking) understanding, DNA stores the information in sets of 3 base pairs called codons which each correspond to an amino-acid. I think there is a starting and ending codon as well.
However, I think that the ability to create a protein isn't enough to copy a cell, the cell also must know how to arra... | askscience | http://www.reddit.com/r/askscience/comments/2q5upk/if_dna_stores_information_of_how_to_make_proteins/ | {
"a_id": [
"cn3nqbn"
],
"score": [
9
],
"text": [
"its horribly complicated and we dont know completely yet. I'll keep to the basics. also have to be careful by what you think of as information\n\nfirst off, DNA codes for more than just proteins, it also has regulatory sequences in it (promoters,... | [] | [] | [
[
"http://www.ndsu.edu/pubweb/~mcclean/plsc431/prokaryo/prokaryo2.htm"
]
] | |
5501af | If heavy elements are formed due to supernovae, how come we have so much of them on Earth if supernovae are relatively rare events? | From what I've read a supernova happens once every 50 to 100 years in the Milky Way. That seems like a pretty low rate considering the amounts of heavy elements that just so happened to clump together while the Earth formed. | askscience | https://www.reddit.com/r/askscience/comments/5501af/if_heavy_elements_are_formed_due_to_supernovae/ | {
"a_id": [
"d87b6va",
"d880m8a"
],
"score": [
4,
2
],
"text": [
"The elements which only can be formed by supernovae, elements heavier than Nickel, together account for about 0.05 ppm (parts per million) of the matter in the universe - for every ton (1000 kg) of matter, there is 0.05 g of... | [] | [] | [
[],
[]
] | |
6fjahm | Was China trying to kill the 14th Dalai Lama in 1959? Or were they just generally going for Tibet? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/6fjahm/was_china_trying_to_kill_the_14th_dalai_lama_in/ | {
"a_id": [
"dk58q84"
],
"score": [
9
],
"text": [
"Hi there, sorry I'm late. \n\nYour question seems to imply a misunderstanding of the timeline. \n\nThe People's Liberation Army launched their invasion/liberation of Tibet in October 1950. Tibet was then led under the name of Tenzin Gyatso, the D... | [] | [] | [
[
"https://www.reddit.com/r/AskHistorians/comments/6inuma/what_was_the_current_dalai_lama_like_in_his_youth/"
]
] | ||
33abnl | if plants produce oxygen, then is breathing in a garden "easier" or better for you than breathing inside a building? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/33abnl/eli5_if_plants_produce_oxygen_then_is_breathing/ | {
"a_id": [
"cqizkio",
"cqizkxe"
],
"score": [
9,
2
],
"text": [
"You don't use a lot of the oxygen you inhale in either case. We generally inhale about 21% oxygen from the atmosphere. The air we exhale is about 16% oxygen. ",
"Not significantly. Oxygen diffuses through the atmosphere ... | [] | [] | [
[],
[]
] | ||
1ptjl0 | what exactly is a "double-blind" study? | Also, what other kind of studies are there? Single-blind? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1ptjl0/eli5_what_exactly_is_a_doubleblind_study/ | {
"a_id": [
"cd5v75j",
"cd5v7db"
],
"score": [
9,
5
],
"text": [
"The tester and the subject are both 'blind'. If you're doing a cola taste test double blind then the person presenting the drinks and recording the data doesn't know which is Pepsi and which is Coke, and neither does the per... | [] | [] | [
[],
[]
] | |
2xuire | Is water pressure the same regardless of the volume of water? | If you went to the middle of the atlantic ocean and measured the pressure 100 ft down then took water from that part of the ocean and filled a 100ft tall 3 inch wide vertical cylinder with it and measured the water pressure at the bottom of that would the pressure readings be the same? | askscience | http://www.reddit.com/r/askscience/comments/2xuire/is_water_pressure_the_same_regardless_of_the/ | {
"a_id": [
"cp3u834"
],
"score": [
6
],
"text": [
"Liquid pressure (P) is dependent upon three things:\n\n1) density (p)\n2) gravity (g)\n3) height aka depth (h)\n\nRepresent by the equation P = pgh.\n\nSo the pressures would be the exact same in your scenario.\n\nAlthough if you're talking about... | [] | [] | [
[]
] | |
35bdj5 | Is there a limit to the amount of languages a person can learn? | askscience | http://www.reddit.com/r/askscience/comments/35bdj5/is_there_a_limit_to_the_amount_of_languages_a/ | {
"a_id": [
"cr2vyns",
"cr2xkuz"
],
"score": [
49,
286
],
"text": [
"I've labelled this submission \"Sources Required\", which means that top level replies should be able to directly cite some scientific research on this topic. Top level replies which do not do so are acceptable if and onl... | [] | [] | [
[],
[]
] |
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